Alexander Egyed Wuwei Shen Kun Wang Maintaining Life Perspectives During the Refinement of UML Class Structures. 310-325 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3442&spage=310 2005 conf/fase/2005 FASE db/conf/fase/fase2005.html#EgyedSW05